USB interface adapter for the Hifei Swordfish Esc's. This is needed to program the Swordfish esc's using your Windows PC. Note: Software install requires Microsoft Windows XP or newer Windows PC and a very good understanding of installing drivers and changing settings in Windows. Please purchase the Program Box if you are not up to making these changes. NOTES: When using this with the Swordfish ESC's that have NO built in BEC(battery eliminator circuit), you will also need a 4cell AA receiver pack to power the programmer. Otherwise the Swordfish esc's that come with a bec circuit will use the bec to supply power to the programmer. Note: This will not work with Swordfish X Series escs.